Video message protocol optimization.

git-svn-id: https://source.sakaiproject.org/svn/portal/branches/SAK-23349@125089 66ffb92e-73f9-0310-93c1-f5514f145a0a
Avoid split with video disabled.

git-svn-id: https://source.sakaiproject.org/svn/portal/branches/SAK-23349@125097 66ffb92e-73f9-0310-93c1-f5514f145a0a
Get my id from portal.

git-svn-id: https://source.sakaiproject.org/svn/portal/branches/SAK-23349@125098 66ffb92e-73f9-0310-93c1-f5514f145a0a